Authorities are investigating after a suburban man was stabbed to death at a local restaurant late Saturday night.

WAUKEGAN, Ill. (WLS) -- Flowers, balloons and a city notice, announcing a temporary closure due to safety concerns adorn the restaurant where family and friends say its co-owner, Joshua Kirkwood, poured his life into.

Joshua Kirkwood, 51, was fatally stabbed Saturday night during an altercation at his restaurant, Forty One Fourteen Steaks and Seafood on Green Bay Road in Waukegan.

WAUKEGAN, Ill. (CBS) -- Police in Waukegan were investigating a stabbing inside a restaurant overnight Saturday into Sunday. Crime scene tape surrounded 41 14 Forty One Fourteen Steaks & Seafood, at 2120 N. Green Bay Rd. in Waukegan, just after 1 a.m. Sunday.

Waukegan was stabbed to death inside the restaurant late Saturday night during a gender reveal party and his girlfriend and two of her sons are in custody.